Stencil type duplicating machine



Jan. 1, 1935'- c. N. JOHNSON ET AL I STENCIL TYPE DUPL ICATING MACHINE Filed Jufie 18, 19:50

5 Sheets-Sheet 1 v I ITLzJTUZFrs C Z if ford JV? dahnson. Kenneth W 6&1?

Jan. 1, 1 935. c-' N. JOHNSON AL 1,986,205 I STENCIL TYPE DUPLICATING MACHINE Filed June 18. 1950 5 sheets-sheet 2 Inc/811m Clifford 1v: \jbhmon Kenneth; W'QZW'I' 1935- v::. N. JOHNSON ET AL STENCIL TYPE DUPLICATING MACHINE Filed June 18, 1950 5 Sheets-Sheet, s

fnveflira JW kjahnson.

' Cliffdrd Knnefl L W62]? Jan. 1, 1935 Filed June 18. 1930 .5 Sheets-Sheet 4 lTLUa iwr's Clifford JV LTohnson Kenna???) Via/7' Jan. .1, 1935., c. N; JOHNSON EI'AL 1,936,205

STENCIL TYPE DUPLICATING MACHINE Filed June 18, 1930 5 Sheets-Sheet 5 S 171067116719 Clifford jvfdhnson Kenneth. War

Patented Jan. 1, 1935 PATENT OFFICE STENCIL TYPE DUPLICATING MACHINE Cliflord N. Johnson, Chicago, and Kenneth W.

Carr, Oak Park, 111., assignors to Ditto, Incorporated, Chicago, 111-,

Virg nia a corporation of West Application June 18, 1930, Serial No. 461,888

'7 Claims.

- The invention relates to stencil duplicating machines and more particularly to rotary stencil duplicating machines of the type employing a rotatable cylinder and an impression roller between which and the rotatable cylinder is fed a sheet of paper to receive an impression from the stencil sheet mounted on the cylinder.

An object of the present invention is to provide in a rotary stencil duplicating machine of the type described mechanism for automatically feeding each sheet of paper to be printed to the rotatable cylinder and for simultaneously impressing the same upon the surface of the stencil sheet. The impressingof the sheet of paper upon the stencil sheet is accomplished by the impression roller. If the roller is actuated without a sheet of paper being interposed between the same and the cylinder, the roller would receive the ink with the result that another printing operation could not be performed until the ink had been completely cleaned from the roller. Another object therefore is to provide the mechanism mentioned with novel means for preventing the impression roller from receiving ink from the surface of the stencil sheet. I

Another object of the invention is to provide paper feeding devices having improved means for correctly positioning the sheet of paperto be printed relative to the stencil sheet prior to presenting the same to the stencil sheet for impression thereon, whereby the imprint from the stenoil will be exactly in the desired location and alignment on each sheet.

Another object of the invention is to provide a magazine for holding the sheets of paper to be printed having means for continuously causing the top sheet of paper to engage a feed roller.

A yet further object of the invention is to provide improved supporting means for the magazine capable of being easily and quickly removed as a unit from the frame of the machine.

A yet further object is to provide in a rotary duplicating stencil machine improved mechanism for applying ink to the stencil sheet, the mechanism'being located within the rotatable cylinder and embodying means whereby the quantity of ink discharged from the ink reservoir can be regulated as desired, the surplus ink being automatically returned to the reservoir.

A still further object of the invention is to provide improved inking means which will maintain a film of ink over the inside surface of a perforated drum and which will replenish the same at each revolution of the cylinder, the ink permeating the 'more fully described and particularly pointed out in the specification, drawings and claims appended hereto.

In the drawings, which illustrate an embodiment of the device and wherein like reference characters are used to designate like parts:

Figure 1 is an elevational view of a complete s encil duplicating machine constructed in ac-v cordance with the present invention;

Figure 2 is a sectional view of the same taken substantially along line 2-2 of Figure 1;

Figure 3 is a sectional view taken along line 3-3 of Figure 2;

Figure 4 is a detail sectional view taken along line 4-4 of Figure 3, showing the secondary feeding-rollers and the paper stop mechanism;

Figure 5 is a detail sectional view taken along line 5-5 of Figure 3 and showing the primary feeding roller;

Figure 6 is an enlarged detail sectional view of the paper feeding and impression mechanism;

Figure '7 is a perspective view showing the outer shaft for journaling the ink reservoir frame;

Figure 8 is a fragmentary perspective view of a support for the ink applying mechanism;

Figure 9 is a perspective view of the inner shaft for journaling the ink reservoir;

Figure 10 is a fragmentary perspective view of the ink reservoir.

The machine is shown equipped with frame members 10 having bosses 11 provided on their bottom, which serve to support the machine upon any suitable. table or similar supporting means. The frame members are spaced from each other and provide journaling means for a rotatable printing cylinder designated in its entirety by 12. The cylinder comprises spaced end members 13 having inwardly directed flanges 14 which have'secured at 15 so as to form an enclosed cylinder, a perforated plate 16 forming substantially one half of the periphery of a cylinder, the other half comprising an enclosure member 17 provided with a filling cap 18 and flanges 20, the flanges serving to secure the closure member to the end members through upon rods 23.

over the cloth 22 and is held in place upon the cylinder by means of resilient clips 25, secured to a cross bar 26 which joins the end members 13. The stencil sheet 24 is thus secured upon the periphery of the rotatable cylinder 12 and firmly held in position by clips 25 but may be easily removed and replaced since the clips are made resilient for the purpose.

For journaling the cylinder 12 upon the side frames 10, inwardly directed bearings 27, Figure 2, are provided, one of which is located adjacent to hub 28 secured to the right hand end member 13 and the other of which engages a roller bearing assembly 30 mounted within the gear 31, the

gear in turn being secured to the left hand end member 13. A shaft 32 passes through the hearing 27 and the hub=portion 28, the shaft being keyed to the hub portion by means of dowel pins 33. On the extreme right hand'end of shaft 32 is keyed or otherwise secured a pulley 34 adapted to be connected by an endless chain to an electric motor or similar source of power, for driving the cylinder. Mounted in the other bearing 27 and extending through the roller bearing 30 is an outer shaft 35 which is prevented from rotating by means of dowel pins 36. The shaft 35 is provided with an inner shoulder 37 which functions'as spacing means for structure to be described. Located within the outer shaft 35 is an inner shaft 38 having riveted to its outer end a pointer 40 and being provided on its inner end with an opening 41. On the face ofthe shaft 38 adjacent the opening-41 is provided lugs 42. The outer shaft 35 is also provided with similar lugs 43 on the face of the shoulder 37. ,The shaft 32, as shown in Figure 2, is provided with a reduced extension 44 which is adapted to flt within the opening 41, thus detachably connecting the shaft 32 and shaft 38 to form a continuous member extending between the bearings 27. As the end members 13 are secured, one to the hub 28 and the other to the gear 31, both the hub and thegear being mounted upon the continuous member, it is thus seen that the cylinder is journaled for rotation within the frame members 10 and is adapted to be driven by pulley'34.

The inking mechanism is located within the cylinder 12 and includes-an ink tank or reservoir 45, having semi-circular end members 46 and 47. Located on one side of the ink tank is an integral depending bib 48. The ink tank is supported from the shaft 32 by means of a roller bearing 50, secured to the right hand member 57 and upon which is rotatably mounted the end member 47. The end member 46 is provided with an opening having horizontal slots 51, whereby the reduced portion 44 of shaft 32 can be passed through the end member while the horizontal slots 51 serve to non-rotatably secure the tank to the shaft 38 since the lugs 42 engage within the slots 51. The ink tank is thus supported from shaft 32 in a manner for pivotal movement so as to locate the upper edge of the ink tank either above or below a horizontal plane, as rotation imparted to shaft 38 will be imparted to the tank by means of the lugs 42 and slots 51. The pointer 40 riveted to shaft 38 serves to indicate the position the resering shaft 32.

voir assumes within the cylinder and also allows adjustment of the tank as desired.

In operation ink is continuously supplied to the stencil sheet from the tank as paddles 53 con nected by 5,4 are located intermediate the revolv- The paddles alternately pass through the ink raising a small amount to the edge of the tank whereupon the same flows over the side provided with the bib 48, from which it drips to the bottom of the cylinder 12. This construction provides for a continuous flow of ink from the tank, the flow resulting from the operation of the paddles which in turn are actuated by the revolving shaft 32.

It is desirable in order to secure uniform distribution of ink upon the printed copies to uniformly distribute the ink-over the entire surface of the perforated plate 16. In this connection the present invention contemplates ink applying and retrieving mechanism which comprises a U- shaped member 56, having arms 57 and 58. The arm 57 is mounted on the roller bearing while arm 58 is provided, as shown in Figure 8, with an opening 60 and horizontal slots 61. By means of the opening 60, the arm 58 is mounted upon shaft 38, while the horizontal slot 81 serves to nonrotatably secure the member 56 to the outer shaft 35 as the lugs 43 are adapted to fit within the horizontal slots. As the shaft 35 is prevented from rotation by the dowel pins 36, it is thus seen that the member 56 is rigidly supported within the cylinder 12. The upper ends of the arms 57 and 58 are held in spaced position by a cross bar 62 and are also adapted to have mounted therein 'a shaft 63. Pivotally mounted upon the shaft are a plurality of arms 64, which are connected at their outer ends by a supporting bar 65 to which is secured an upstanding brush 66. To the opposite end of one of the arms 64 is integrally formed a depending extension 67, Figure 3, into which is threaded a set screw 68 maintained in contact with arm 58 by means of the coil spring 69 secured at one end to the extension and at its other end to the arm whereby the brush 66 is held in contact with the interior of the cylinder. Intermediate-the arm 64 and the extension 671s mounted a roller 70 by means of a stud 71 and bearing 72, the bearing being soldered or otherwise secured to the inner surface of the extension 67. By this construction, the brush 66 is pivotally mounted within the member 56 and is adapted for adjustment by means of the set screw 68 engaging arm 58. An arcuate cam 73 is secured inside the end wall 13 adjacent the arm 58 by means of rivets 74, the cam being so positioned that at proper intervals in the rotation of the cylinder the cam will have engagement against the roller 70 to force the roller 70 in an upward direction to cause the brush 66 to move in a downward direction. This movement of the brush 66 takes care of the reduced circumference of the cylinder, caused by the closure member 17. It is to be noted that the brush 66 is disposed substantially over the center of the ink tank 45 and as the same has engagement against the inner surface of the cylinder, the ink supplied to this surface will be be presently described, the arms '16 have integrally formed therewith inclined arms so that movement of the arms '16 to move the impression roller '14 into and out of contact with the rotatable cylinder will cause corresponding movement of the inclined arms80. Formed on one of the arms '16 is an outstanding lug 81 into which isthreaded a set screw 82, the set screw being locked in adjusted position by means of nuts 83. The impression roller '14 is resiliently urged into engagement with the rotatable cylinder by means of a spring 84, Figure 6, secured at one end to the side frame 10 by means of pin 85 and fastened at its other end to the inclined arm 80 by pin 86. For moving the impression roller out of contact with the cylinder the same is provided with an arcuate cam 8'1 secured to the left hand end member 13 and extending slightly beyond the periphery of the member. The cam, as shown in Figure 2, is adapted to have engagement with the set screw 82 to cause downward movement of the arm 76 and thus the impression roller '14.

Located in advance of the impression roller as determined by the direction of movement of the sheet of paper to be printed, are a plurality of feed rollers 88 and 89, which for clarity will be termed secondary feed rollers. The .-roller 89, preferably of rubber or like material, is mounted on a transverse shaft 90 and comprises a .plurality of sections spaced from each other as clearly shown in Figure 4. The-shaft is driven by means of pinion 91 secured to one end-which pinion has meshing engagement with an intermediate gear 92 pivotally mounted upon the side frame 10 by means of stud 93. A second intermediate gear 94 pivotally mounted upon the side frame by means of stud 95 has meshing engagement with the gear 92 and also gear 31 secured to the rotatable cylinder.

The feed roller 88 also formed of a plurality of sections spaced from each other is mounted upon a transverse shaft 96, which shaft is mounted within slots 9'1 in the side frames 10 for substantially vertical movement into and out of contact with roller 89. The shaft 96 is resiliently urged into engagement with roller 89 by means of springs 98 located within the slots 9'1, which springs have engagement with blocks 99. The blocks are of a width to loosely fit within the slots 9'1 and have a curved formation on their under surface for engagement with the reduced extensions 100 of the shaft 96. At times in the operation of the secondary feeding rollers it is necessary that the rollers 88 and 89 be spaced from each other which is accomplished automatically by a cam secured to the rotatable cylinder 12.

The construction comprises spaced arms 101 mountedfor pivotal movement upon a transversely extending shaft 102,- the shaft being journaled in any usual manner in the side frames 10. One end of the arms 101is provided with set screws 103 which have engagement against the under surface of the shaft 96.. The set screws serve to allow adjustable spacing of the shaft 96 from the ends of the arms 101. As shown in Figures 2 and 3, one of the arms 101'is provided with a rearward extension 104 to which is secured by means of stud 105 a rollerv 106. The roller is adapted to have engagement with the adjustable cam 107 secured to the outer surface of the-right hand end member 13. The cam is formed with an arcuate slot 108 by means of which the cam is. adjustably positioned upon the end member 13 through pins 110. A thumb screw 111 serves to securely fasten the cam in adjusted position upon the end member. Once in every revolution of the rotatable cylinder 12 the cam 107 will engagethe roller 106 and will function to cause downward movement of said roller resulting in corresponding upward movement being imparted to the arms 101 and thus the shaft 96. It is therefore seen that during engagement of the cam 107 with the roller 106 the roller 88 will be held in a position spaced from the roller 89.

Associated with the secondary feed rollers is a paper stop and feeler' mechanism which positions the paper fed to the secondary rollers and also functions to allow the impression roller to be moved into engagement with the rotatable cylinder. As shown in Figure 4 the mechanism includes a paper stop 112 extending the entire width of the rollers 88 and 89 and having extensions by means of which studs 113 are secured to the device. Adjustable set screws 114 are provided in each of the side frames 10 and are formed with a pointed end for engaging the studs 113, thus mounting the paper stop for pivotal movement within the side frames. Extending from step 112 are feeler portions 115, the portions being located between the spaces formed on the shaft 90 by the sections of roller 89 as described. Also secured at each end of the paper stop are depending arms 116 which arms at times are adapted to have engagement with'the inclined arms 80 actu' ated by the cam 8'1. For maintaining the paper stop 112 in elevated position so that a paper sheet fed to the secondary rollers will be engaged thereby, a resilient spring 117 is provided secured at one end to the side frame 10 by means of a pin 118 and at its other end to the depending arms 116. A pin 120 located in the side frames limits the rearward movement of arms ,116 byforming a stop against which one of the arms 116 engages. As shown in Figure 3 the arms 116 are retracted by the spring 117 while the cam 107 is in engage-' ment with roller 106 to cause the feed roller 88 to be spaced from its companion roller 89. While the parts assume this position a sheet of paper is adapted to be fed to the secondary rollers from a primary roller, to be presently described, the sheet of paper being located between rollers 88 and 89 and engaging the paper stop 112. Immediately following this occurrence the feed roller 88 moves downwardly to positively grip the sheet of paper and to positively feed the same to the impression roller '14, since feed roller 89 is continuously driven through the chain of gears 92 v and 94, as described. This operation automatically functions'to cause outward movement of the arms 116, since the sheet of paper engages the b feeler portions simultaneously with the positively gripping of the sheet between the rollers 88 and 89. With the arms 116 in outward position the inclined arm 80 is free to move in an upward direction caused by the tension of spring 84, which movement will allow the impression roller 14 to have contact with the rotatable cylinder. It is thus seen that the impression roller is allowed to move upward onto impression only when the sheet ofpaper to be printed is located between the secondary feed rollers when the same. are in spaced position and positively gripped by said rollers to feed the same to the impression roller.

Located in advanceof the secondary rollers is a primary feeding mechanism comprising a primary feed roller 121, Figure 5, adjustably secured to shaft 122 by means of a set screw 123. The shaft 122 is journaled within upstanding arms 124 supported for pivotal movement upon a transverse shaft 125, one of the arms being provided with a tongue 126. The shaft is mounted in the side frames 10 by means of bearings 127 and is adjustably secured in said bearings by means of the threaded end 128, provided with the slotted head 129. Also journaled within the arms 124 is a second shaft 130, having keyed to one end a"roller 131 and at the other end a. gear wheel 132. The roller 131 is adapted to engage the cam 133, provided on the periphery of the right hand end member 13. By engagement of the cam with the roller, the shaft is caused to rotate, which rotation by means of gear 132 meshing with gear 134 keyed to shaft 122, is imparted to the. latter shaft and thus to the primary roller 121. p

Also mounted on transverse shaft 125 is a bracket 135 having a base extending within the arms 124 and being provided with bent side portions 136, the side portions serving to support the bracket on the shaft 125. A- U-shaped member 137, having lugs 138 is secured to one of the side portions 136, as shown in Figure 5. Set screws 139 are threaded into the lugs 138 for engaging the tongue 126, thus positioning. the same and the arms 124 relative to the bracket 135. A back 140 is secured to the rear portion of the bracket 135 by flanges 141, the flanges resting upon a; transverse shaft 142 mounted in the side frames. By the above construction the bracket and the primary feeding mechanism can be removed from the frame as a unit by removing the transverse -shaft 125. The structure however is secured within the side frames in a manner to prevent accidental remo val, since the shaft 125 is provided with a threadedend 128, which end is threaded into one of the side frames.

Cooperating with the primary roller 121 is a magazine for holding the supply of sheets of paper to be printed. The magazine comprising a base 143, having a rearwardly curved portion, as shown in Figure 6, the base being fixedly secured by any suitable means to the bracket 135. A flexible metallic strip 144 forms the rear wall of the magazine and is secured at its upper end to the back 140. The opposite end is free for movement. relative to the back 140 and functions to resiliently urge the supply of paper sheets held in the magazine towards the rubber roller 121, so that the foremost sheet of paper will at all-times have contacting engagement with the roller. 1 Located on the side frames 10 opposite the I magazine is a table 145 for receiving the sheets of paper'after the same have been printed and stripped from the rotatable cylinder. 12. The

straddles the transverse, shaft 77 and also being provided with a portion 147 for positioning upon a transverse shaft 148. By this construction the table is easily removed from the side frames whenever desired. Located above the table are- I a plurality of strippers 150 which, as, shown in Figure 6, are so positioned relative to the rotatable cylinder that they engage the I depending marginal edge of theaheet and strip the same from the stencil sheet 24. The strippers 150 are adJustably positioned upon'a' transverse shaft 151, mounted within bearings 152, formed integrally with the side frames.

In the operation of the present device, reference being had to Figure 3, it is seen that a supply of paper sheets to be printed are located in the magazine and are re iliently urged in a direction so that the foremost eet will contact the rubber .roller 121. This roller remains stationary until located between the rollers and to abut the paper stop 112.

Subsequently to the'operation as set out above, the cam 107 will move out of engagement with roller 106 to cause the secondary feed rollers to positively grip the sheet of paper located between them and to simultaneously feed the same towards the impression roller 74 and to cause the arms 116 to move outward so as to prevent interference with arms 80. Up to this point in the operation the set screw 82 has remained in engagement with the cam 37 but the rotatable cylinder has rotated sufficiently to locate the end of the cam adjacent the set screw so that any further rotation allows the arm 76 to move upward to move the impression roller into contact with the stencil sheet 24 on the cylinder. By this time the sheet of paper to be printed has been advanced sufliciently to have its marginal edge located between the impression roller and the rotatable cylinder and as the roller 74 moves upward the paper is impressed upon the stencil sheet on the cylinder. Continued rotation of the cylinder causes continued feeding of the paper sheet by thesecondary rollers to the rotatable cylinder until the entire sheet has been impressed thereon. :The machine functions at the proper time to cause movement of the impression roller out of contact with the cylinder so that the roller does not have engagement against the cylinder except when a sheet of paper to be. printed is located therebetween. The strippers 150, as shown in Figure 6, engage the marginal edge of the paper depending from the stencil sheet to strip the same from contact with the stencil sheet so as to locate the printed c py upon the table 145. i It is to be understood that we do not wish to be limited by the exact embodiment of the device shown, which is merely by way of illustration and not limitation, as various and other forms of the device will of course be apparent to those skilled in the art without departing from the spirit of the invention or'the scope of the claims. We claim: 1. In an apparatus of the character described, an impression roller, pivoted arms supporting said roller, paper feeding rollers mounted in advance of said impression roller, a paper stop device associated with said feeding rollers, and means secured to said paper stop for regulating the pivotal movement of said supporting arms.

of the cylindrical portion of the cylinder to retrleve the-surplus ink discharged and return the same to said tank.

3. In a device of the character described, in

combination, a rotatable cylinder having a stencil sheet secured to the periphery thereof, a shaft journaling said cylinder within side frames, means for supplying ink to said stencil sheet comprising, a tank for containing a supply of ink, means mounting said tank on portions of the shaft disposed within the cylinder, a supporting member mounted on said shaft adjacent the tank, a brush pivotally secured'to said member and adapted to have cooperating relationship with the inside surface of the cylindrical portion of the cylinder, and means disposed outside said cylinder for adjustably positioning the tank on said shaft.

' 4. In a device of the character described, in combination, a rotatable cylinder'hav'mg a stencil sheet secured to the periphery thereof, a shaft journaling said cylinder within side frames, means for supplying ink to saidstencil sheet comprising, a tank for containing a supply of ink, means mounting said tank on portions of the shaft disposed within the cylinder, a supporting member mounted on said shaft and having arms straddling the tank, a member pivotally mounted in the upper ends of said arms, a brush supported by said member, means located on said member opposite the brush, a cam secured to the inside surface of the cylinder substantially concentric with the shaft, said cam engaging said means during the rotation of the cylinder to cause movement of the brush towards and away from the inside surface of the cylindrical portion of the cylinder. 4

' 5. In a device of the character described, in

combination, a rotatable cylinder, a stencil sheet mounted on the periphery of said cylindenan internal inking device located within the cylinder, means for supplying ink to said stencil, said means causing a continuous discharge of ink from said device, the ink being deposited upon the. inside surface of said periphery, and means having contacting engagement with the inside surface of said periphery to retrieve the sur-' plus ink discharged and return the same to said device.

6. In a device of the character described, in combination, a rotatablecylinder having a portion of its cylindrical surface perforated, a stencil sheet positioned over said perforated portion on the cylinder, an internal inking device located within said cylinder including an ink reservoir having a plurality of adjusted positions within said cylinder to regulate the quantity of ink discharged from the reservoir, and means rotating with the cylinder for agitating the ink in said reservoir to cause spilling of said ink therefrom.

'7. In duplicating apparatus, a duplicating drum, an impression roller co-operating with said drum, means for feeding sheets of paper to said drum and said roller, a paper stop device associated with said feeding means, means for displacing said impression roller into and out of its functionally operative position, and a feeler mem- 

